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A DIN standard for gas cylinder valves for test pressures up to 300 bar (4,400 psi). EN 15202 [9] A European standard for LPG equipment and accessories, specifying LPG cylinder valve connections. [10] EN 417: European norm specification concerning non-refillable metallic cartridges for liquefied petroleum gases.
A back-pressure regulator, back-pressure valve, pressure sustaining valve or pressure sustaining regulator is a control valve that maintains the set pressure at its inlet side by opening to allow flow when the inlet pressure exceeds the set value.
The regulator ensures that pressure of the gas from the tanks matches the required pressure in the hose. The flow rate is then adjusted by the operator using needle valves on the torch. Accurate flow control with a needle valve relies on a constant inlet pressure. Most regulators have two stages.
A gas regulator attached to a nitrogen cylinder. From right — cylinder valve, cylinder pressure gauge, pressure control valve (yellow) on regulator (green), outlet pressure gauge, 3-way outlet terminated by needle valves.
POL valve on a 45 kg LPG cylinder Male fitting to match POL valve A POL valve (originally for Prest-O-Lite) is a gas connection fitting used on liquefied petroleum gas (LPG) cylinders. The oldest standard for such connections, it was developed by the Prest-O-Lite company, hence the name. [ 1 ]
Needle valves are also commonly used to provide shut off for the pressure gauge or on applicators to shut off the supply of NH3 to the knives in anhydrous ammonia (NH3) applications. [2] Since flow rates are low and many turns of the valve stem are required to completely open or close, needle valves are not used for simple shutoff applications.
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Larner–Johnson Valve: needle control valve often in large sizes used in water supply systems; Leaf valve: one-way valve consisting of a diagonal obstruction with an opening covered by a hinged flap; Line blind valve: a thin sheet oriented perpendicular to the pipe. The sheet has a solid end and a flow-through end; sliding it from one position ...
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